Manual for Induction Motors and Generators
Maintenance - 65
3BFP 000 050 R0101 REV E
Table 7-2. General tightening torques
NOTE: The values in Table 7-2 General tightening torques are general, and do not apply to
various items, such as diodes, support insulators, bearings, cable terminals or pole
fastenings, bus bar terminals, surge arrestors, capacitors, current transformers, rectifier
and thyristor bridges, or if some other value is given elsewhere in this manual.
7.4.2 Vibration and noise
High or increasing vibration levels indicate changes in the machine's condition. Normal levels
vary greatly depending on the application, type and foundation of the machine. The vibration
measurements and levels are discussed in detail in Chapter 7.4.3 Vibrations. Some typical
reasons that might cause high noise or vibration levels are:
• Alignment, see Chapter 3 Installation and Alignment
• Bearing wear or damage
• Vibration from connected machinery, see Chapter 7.4.3 Vibrations
Tightening torque in Nm (pound-feet)
Property class 8.8 for bolts
Size Oiled [Nm] Oiled [pound
feet]
Dry [Nm] Dry [pound
feet]
M 4 2.7 2.0 3.0 2.2
M 5 5.0 3.7 5.5 4.1
M 6 9 6.6 9.5 7.0
M 822122418
M 10 44 32 46 34
M 12 75 55 80 59
M 14 120 88 130 96
M 16 180 130 200 150
M 20 360 270 390 290
M 24 610 450 660 490
M 27 900 660 980 720
M 30 1200 890 1300 960
M 36 2100 1500 2300 1700
M 39 2800 2100 3000 2200
M 42 3400 2500 3600 2700
M 48 5200 3800 5600 4100
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